Buttonhole-cutting device.



E. B. ALLEN.

BUTTONHOLB CUTTING. DEVICE.

APPLICATION HLBD MAY4,1912,

Patented Deo. 80, 1913.

2 SHEETS-SHEET;1 2.

1 upon which rests the frame constructed with. the bed-plate 2 and bracket-arm including the hollow standard 3 and overhanging tubular Ineinber terminating in the head 5. In practice, the bracket-arm head 5 has nounted therein a swinging fraine in which is journaled the reciprocating needle-bar@ carrying the laterally jogging needle T having cooperating therewith in the production of overseani stitches, the shuttle 8 which is mounted in the race 9 depending lfrom the bed-plate and actuated by means of the rotary shuttle driving arin l Whose hub 1l is iixed upon the rockshaft 12 driven by suitable means.

Secured by means of screws 13 upon a suitable seat therefor provided in the upper face ofthe bed-plate 2' are the feet 14 hav- 'ing' the screw-apertures 15 and provided at their adJacent ends with the standing ribs.

16 sustaining the forwardly extending needle-plate 1T provided with the transverse needle-slot 1S and the longitudinally disposed knife-slot 19 arranged at one side of tlie'center of the needle-plate and rearward of the iieedle-slot- Suitably joui'naled within fixed bearings of the bracket-arm head is the reciprocating knife-bar Q0 carrying the block 21 havinga rearwardly extending ear 22 yapertured to embrace the guide-'bar 23 and having secured ,to the depending 'portion 24'by inea-ns of the screw 25 the knife-blade 2G sustained'permanentlyr in register with the knife-5101319 of the throat-plate. The knifebarfO is connected by nieans of the link 2T with the forward arin 28 of a rock-lever fulcrunied upon the stud-screw 29 carried by the bra'clet-arin 4- and having the rearwardly extending arm 30 connected by means of the link '31 vvith the forward arni 3Q of a second rock-lever mounted upon the fulcruin-stud sustained by the standard 3 and having the reai\\'aidly extending arm- 3-i formed with the slot embracing the stud 3G which is carried by the springpres-:ed plunger 37 of the stop-n'iotion mounted in the swinging lever 38 and adapted for engagement withy the periphery' 39 arin t8 with hooked extremity 49 adapt-ed for engagement vwith the tripping 4stud 50 upon the periphery of the feed cam-Wheel 5l for disengagement of the arm 46 with the rod 43 to enable the lever 38 to assume stopping position under 'the action of itsV spring 52'. The engagement of the eccentric periphery 39 of the stopping cam. With the end' of the plunger-bar 37 causes the L descent of the latter in opposition to its spring and the consequent descent of the knife-bar 20.1 01 a cutting operation, the parts being restored to initial position by the rise of the plunger-bar? to enter its stopping notch adjacent the shoulder 4 0 of the stopping cam.

Fitted in suitable guideways of the bedplate isthe'cross slide-plate -5ft which is formed with an elongated opening 55 of 'ilo Work and having a Width exceeding that of theneedle-plate by the extent-of side-shift movement of the work-holder in passing from one side-stitching'position' tothe other. These slide-plates. are provided with suitable connections with the feed-cam 51 from which they derive their respective operative movements..v l

Secured upon the slide-plate 56 is the bearing bracket 58 having mounted thereon by means of the pivotal pin 59 .the rocking block G0 toavhich is secured the springpressed arin61 provided with the clamping foot- (52 adapted to clam) the Work upon the vneedle-plate and in practice .apertured 4to adinitf the needle and-the cutting knife. in the. machine, as represented inA thepatents beforeL mentioned, the throat-plate' was iso . 1 substantially the length ofl the needle-plate 00 -17 but'of a Width materially greater than mounted upon the cross slide-plate, and the clamping. foot: drew thefabric lengthwise ovger'theiface pfithe throat-plate in performing its longitudinal feeding movements therepnggbut in the present machine, as the throatplate is Stationary, the fabric is drawn over the face of the latterlengthwise of the buttonhole in the sidestitching operations and also crosswise thereof in the sideshift movements for the end stitching operations; .f

As will be seen by reference to the drawings, the lower extremity of the knife-blade E26 isnot contracted to form a chisel-edge lout terminates ina flat lower. face 26 substantially -at right angles to the side faces and at an inclination with the face of the needle-plate so as to form a cutting edge of substantially rectangular shape inclosing a space having a width equivalent to the full width of the knife-blade and a length proportional to that of the'blade. lThe knifeslot 19 of the plate "17 is correspondingly formed, and is closed at both the sides and the ends, thereby providing a complemental cutting member affordin a die to receive the punch which the blunt knife-blade con? i opposite side of the shaft, thereby leaving a clear space beneath the slot 19. It will therefore be seen that the cuttings will not only7 be wholly removed from the fabric at the completion of a stitching operation, but will be 'ejected thro-ugh the throat-plate at' a time when a clear space is left to enable them to pass down into the` machine base ,without being deflected into the shuttle-race so as to clog the saine in subsequent stitching operations. Vfhile this is a desirable feature of the present improvement, it is evidently not essential to the effective disposition of the cuttings.

: [n the-machine represented in the draw-A ings. the cutting action is designed to take 1 f, TV place at the completion of triennal earring operation and while the stitchforming mechanism is producing the last or a few fastening stitches.

' f L f'tl "i takes place after the second step o ie sic. eshift of the work to bring the work-holder T he cutting therefore in initial side-stitching position, and the' knife-slot 19- is therefore disposed at one side of the center of the throat-plate to insureA the proper register of the cutting elements with Vthe lspace intermediate the parallel lines of side stitching.

Having thus set forth the nature of the invention, what l claim herein is:-

1, 1n a buttonhole sewing machine, in combination, a support, a reciprocating cutter-carrier mounted in bearings fixed relatively to said support, a punch mounted lin said carrier and. formed witha continuous cutting edge with opposite portions inclosingv an intervening space, stitch-forming mechanism comprising a reciprocating needle, a throat-plate fixed upon said support, one portion thereof being. provided withv a needle-aperture and an adjacent integral portion thereof being provided with an aperture peripherally closed to afford a cutting die in permanent register with said punch and wholly independent of the needleaperture, a work-holder formed with an aperture to receive said throat-plate, actuating means for the stitch-forming mechanism and said punch, and means for producing relative traveling movements between the worl'r-holder and the stitch-forming niechanism.

2.111 abuttonhole sewing machine, in

combination, a frame constructed with-a .bed-plate and an overhanging bracket-arm,

a reciprocating cutter-carrier journaled in fixed bearings of the bracket-arm, a punch mounted in said carrier and formed with a continuous cutting edge with opposite portions inclosing an intervening space, stitchforniing mechanism' comprising a reciprocating and laterallyjoggi'ng needle mounted in said bracket-arm, a stationary throatplate secured upon said bed-plate and provided .with an elongated needle-aperture and `with an adjacent independent and peripherany closed aperture to afford a cutting die for cooperation with said punch, a laterally and longitudinally. movable work-holder having a lower member apertured to embrace said throat-plate, independentactuating means for the stitch-forming mechanismand said cutter-carrier, and means for producing longitudinal feeding increments' and side-shift movements of said work-holder relatively to said throat-plate.

In a butt-onhole sewing machine,l in combination, a support, a reciprocating cutter-carriermounted in bearings ixed relatively to said support, a punch mounted in said carrier, stitch-forming mechanism coniiinising a reciprocating needle, a throatplate fiXetLupon-said support and provided with a n.eedle.aperture` .and Vwith an adjacent aperture peripherally closed to afford a cutting diea work-hoider having 'a menober formed with an aperture to receivel said throat-plate and'to permit. lateral and longi- -tiidin'al movements of said member,V whose ioo 4 message@ Work-supporning surface 1s maintained 1nv v In testimony whereof,-1 havesigned my 'substantially the Work-supporting surf-ace name to this spe'cififzation,v in the presence vof plane of said throat-plate, actuating means twoy subscribing Witnesses. A

for the stitch-forming mechanism and said EDWARD RALLEN. .3 punch, and means for producing'relative Witnesses:

traveling movements between the Work- E. LTOLLES,

holder and the stitch-formingr mechanism. H. J. MILLER. 

